JPS6080598A - Method and device for separating lead frame - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for separating lead frames, and more particularly, the present invention relates to a lead frame separating method and an apparatus thereof, and more specifically, the present invention relates to a lead frame separating method and apparatus, and more specifically, it is possible to separate a single metal strip into two connected leads having, for example, comb-like lead portions intertwined from both sides. The present invention relates to a method and apparatus for separating lead frames that can efficiently separate frame strips formed into frame strips without entangling the lead portions.

In recent years, the press working of lead frames has become more multi-striped, and for example, as shown in FIG. 1, two comb-like lead frames 10a and 1Ob are opposed and connected at the tips of lead portions 12. In order to separate such a lead frame strip, it is possible to easily separate the lead frame strips by cutting the connecting portion at the tip of the lead portion 12 with an appropriate cutting device, and then arranging the separating plate 14 at the center in the feeding direction. . However, in order to save on materials, the comb-shaped lead portions 16 may be formed into two connected lead frame strips by intertwining with each other, as shown in FIG. In this case, after cutting the connecting portion 18, the lead portions 16 must be separated in a direction perpendicular to each other's planes so that they do not become entangled, but they must be separated in the feeding direction as shown in FIG. If the separating plate 14' is interposed in the vertical direction, the separating plate 14' itself gets entangled with the lead part 16, and the separation can be performed successfully.tk) There are 8 points. In particular, a lead portion 16 with a step formed thereon as shown in FIG. 2(c) is more likely to become entangled.

The present invention has been made in view of the above-mentioned difficulties, and its purpose is to improve efficiency by eliminating the need for the lead parts to get entangled with each other, even when the comb-like lead parts are intricately formed into multiple threads. The purpose of the present invention is to provide a method and device for separating lead frames that can be separated well, and its characteristics are as follows. In order to separate each continuous lead frame strip or each lead frame strip forming a sheet shape in which a predetermined plurality of unit lead frames are connected, the metal strip is first appropriately cut from one end side with a fixed pinch. The metal strip was fed into a device, and the metal strip was sequentially cut into each continuous lead frame strip or each lead frame strip forming a sheet shape in which a predetermined plurality of unit lead frames were connected, and a magnet was attached to the fiif7. An appropriate number of lead frame strips cut by the cutting device are transferred to an appropriate number of lead frame strips cut by the cutting device, and the cut lead frame strips are separated from the adjacent lead frame strips and their mutual surfaces. The leads are conveyed and separated while being sucked so as to separate them, and cutting by the cutting device is performed while sucking a predetermined position on the lead frame M' with the magnetic force.

Preferred embodiments of the present invention are attached below in detail based on the drawings.
I will explain to I11.

In FIG. 3, reference numeral 20 denotes an IJ-le, which retractably winds a metal strip 22 formed around two lead frames to be separated as shown in FIG.

Reference numeral 24 denotes a feeding device, which feeds the metal strip 22 fed out from the IJ-rule 20 intermittently into the press 26 with a predetermined pinch. The feeding device 24 is, for example, a frame portion 28a on both side edges of the metal strip 22.

28b, by engaging feed claws (not shown) with feed holes 30 (see Fig. 2) provided at regular intervals, or feeding intermittently, or feeding by a feed roller (not shown), etc. Various types can be adopted.

The press machine 26 operates in synchronization with the feeding device 24, and presses the metal strip 22 fed by the feeding device 24.
While cutting the connecting work 8, a predetermined plurality of unit lead frames are cut into a sheet shape in a state of being connected at regular intervals. While the connecting portion 18 is being cut, the lead frame strip sheet is separated into upper and lower parts by a carry-out conveyor, which is a carry-out device described below, and is conveyed at the same time as the sheet-like cutting is completed.

32 is a carry-out conveyor, which is installed following the press machine 26. 34 is also a carry-out conveyor, and above the carry-out conveyor 32, one end on the press machine 26 side is close to the carry-out conveyor 32 below, and the other end is close to the carry-out conveyor 32 below.
It is arranged at an angle so as to be away from the Note that FIGS. 4 and 5 are detailed views of the discharge conveyor portion.

36a.

36b is a rotating roller of the carry-out conveyor 32, which is rotatably supported by an appropriate member (not shown). Further, 38 is the conveyor belt. 40a.

40b is a rotating roller of the carry-out conveyor 34, which is rotatably supported by an appropriate member (not shown). Further, 42 is the conveyor belt. 44 is a gear coaxially fixed to the rotating roller 36a; 46 is a gear coaxially fixed to the rotating roller 40a and meshing with the gear 44;
The number of teeth of the gear 44 is set to be slightly larger than the number of teeth of the gear 44, and the discharge speed of the lower discharge conveyor 32 is set to be slightly higher.

Reference numeral 48 denotes a guide member having a substantially arcuate curved surface, which is disposed between the press machine 26 and the carry-out conveyor 34, and whose one end on the press machine 26 side is connected to two lead frame strips cut by the press machine 26. The frame portion 28a of one of the lead frame strips faces downwardly, and the other end faces the conveyor belt 42 of the delivery conveyor 34 in close proximity to the lower surface of the frame portion 28a of one of the lead frame strips for guidance. This feeds one lead frame strip onto the conveyor belt 42 of the discharge conveyor 34.

A magnet 50 is provided over a predetermined length from near the end of the guide member 48 in contact with the conveyor belt 42 of the carry-out conveyor 34, and is attached to one lead fed onto the conveyor belt 42 by the guide member 48. The frame strip is suctioned and cut into sheets in which a predetermined plurality of unit lead frames are connected, and simultaneously conveyed by the conveyor belt 42.

49 is also a guide member, and is disposed between the press machine 26 and the lower delivery conveyor 32, and one end on the press machine 26 side is connected to the frame part of the other cut 1-F frame strip. 2ab also faces upward, and the other end faces close to the conveyor belt (38j) of the discharge conveyor 32, and similarly to the above, the frame portion 2 of the other IJ-frame strip
8kl by contacting and guiding the other lead frame strip onto the conveyor pel of the discharge conveyor 32).
38 above and send. A magnet 52 is also arranged over a predetermined length on the lower surface of the conveyor belt 38 of the carry-out conveyor 32, and it attracts the other fed lead frame strip and transports it at the same time as the sheet-like cutting is completed. It looks like this.

Reference numeral 54 denotes a transfer conveyor provided outward from near the lower end of the magnet 50 of one delivery conveyor 34.

56 is a receiving container provided at the end of the transfer conveyor 54;
58 is a receiving container provided at the terminal end of the carry-out conveyor 32.

The two IJ-) frame strips whose connections have been cut by the machine 26 are first guided in the vertical direction by guide members 48 and 49, respectively. Immediately after each lead frame strip is guided, the corresponding magnets 1.5Q, 52 & 1 are cut into sheet shapes in which multiple unit lead frames are connected. Therefore, it is ensured that the lead frame strips are separated and one of the lead frame strips is transferred to the unloading conveyor 34. The lead frame strips are transported by the transfer conveyor 54 and stored in a receiving container 56 in a stacked manner, and the other lead frame strip is transported by the carry-out conveyor 32 and stored in a receiving container 58 in a stacked manner.

Note that the unloading speed of the unloading conveyor 32 is higher than that of the unloading conveyor 3.
4, the opposing, intricate comb-like lead portions 16, shown in FIG. I have to.

Depending on the shape of the lead frame, it may be set in the upper and lower transport columns.

Further, the following modifications are possible in the present invention. That is, (1) The magnet 52 of the lower carry-out conveyor 32 is not necessarily necessary, and the lead frame strip is conveyed in close contact with the conveyor belt 38 by its own weight.

(2) The lower delivery conveyor 32 itself is not necessarily required, and the container 58 is provided in the vicinity of the press machine 26, and the cut lead frame 1 is dropped and accommodated by its own weight.

In addition, separation is possible without providing the guide portion 1A49.

(3) The feeding direction of the metal strip 22 can also be arbitrarily selected, such as so that the surface portion thereof is in the vertical plane. In this case, the feeding device 24° press machine 26. Needless to say, the delivery conveyor and the like must be spatially arranged accordingly.

(4) Alternatively, the lead frame strip may not be cut into sheets, but only the connecting portions of the two strips may be cut and separated, and the lead frame strip may be wound on a reel or the like as it is.

(5) Furthermore, the metal strips 22 are not limited to two strips, but three
It may be of multiple strips or more.

In this case, various modifications are possible, such as all lead frame strips being attracted by magnets and separated and conveyed, or every other lead frame strip being attracted by magnets and separated and conveyed, and the others being allowed to fall naturally and stored.

FIG. 6 shows another embodiment.

In this embodiment, as in the previous embodiment, the kite section! A
48, 49, the lead frame strips are not guided, but the lead frame strips after the joints have been cut are directly sucked and separated by the magnets 64, 66 provided on each discharge conveyor 60, 62. I try to do that. In this case, it is preferable that the magnets 64 and 66 be arranged so as to attract the frame portions 28a and 28b of the lead frame (i), respectively, so as not to attract each other's lead frame strips. In this embodiment, the guide portion 4s (4s, 49) is not necessary, but may be formed to have a short size and provided as a presser.

This embodiment also provides the same effects as described above. Also mentioned above (
Modifications 1) to (5) can be performed in the same manner.

As described above, according to the present invention, it is possible to efficiently separate multiple lead frame strips without entangling the lead portions or the like.

Although the present invention has been variously explained above with reference to preferred embodiments, the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. It is.

[Brief explanation of drawings]

FIGS. 1 and 2 are explanatory diagrams each showing a gold Pfit'i molded in a state in which two lead frame strips are connected. 3 to 5 show a preferred embodiment of the lead frame separation device according to the present invention, FIG. 3 is an overall explanatory diagram thereof, FIG. 4 is a plan view of the main part, and FIG. 5 is the main part. FIG. FIG. 6 is an explanatory diagram showing another embodiment. 10a, 1ob0. Lead frame, 12. . Lead part, 14.14', Separation plate. 16.1. Lead part, 18. ,,connection. 201. Autoreel, 22. , metal 'H1 article. 24., feeding device, 26. press machine. 28a, 28b, , 71z-A part. 30... Sprocket hole 32, 34. ,, unloading conveyor, 36a, 36b, , rotating roller. 38,...:1 conveyor belt, 4 o a, 40
b--, rotation o-5, 42,, conveyor belt. 44.46. ,,gear,48,49. ,,Guide part A4
,50,52. ．． ．． magnet. 54, , transfer conveyor, 56, 58. ,, Uke is a container,
60,62. ,, unloading conveyor. 64.66,,, magnet. Patent applicant Shinko Electric Industry Co., Ltd.

Claims (1)

[Claims] 1. A metal strip made of a magnetic material formed by connecting multiple lead frame strips is attached to each continuous lead frame strip, or a predetermined plurality of one node frame per unit. In order to separate each continuous lead frame strip into sheet-like sheets, the metal strip is first fed into a suitable cutting device from one end at a constant pitch, and the metal strip is separated into each continuous lead frame strip. or each unit lead frame is sequentially cut into sheet-shaped lead frame strips in which a predetermined plurality of unit lead frames are connected, and the lead frame strips cut by the cutting device are cut by an appropriate number of carrying-out devices equipped with magnets. A suitable number of the lead frame strips are conveyed and separated while being sucked so that the surfaces of the cut lead frame strips and the adjacent lead frame strips are separated from each other, and the cutting device A lead frame separation method characterized in that the cutting is performed while a predetermined position of the lead frame strip is attracted by the magnet. 2. A metal strip made of a magnetic material, formed by connecting multiple lead frame strips, is formed into each continuous lead frame strip, or a sheet shape in which a predetermined plurality of unit lead frames are connected. A feeding device that sequentially feeds the metal 1jf strips from one end side with a fixed pinch in order to separate them into each lead frame strip, and a feeding device that feeds the metal strips fed by the feeding device into each continuous lead frame j1¥ strip, or a cutting device that sequentially cuts I and IJ into each lead frame strip in the form of a sheet in which a predetermined plurality of unit lead frames are connected;
Lead frame 417 cut by this cutting device
An appropriate number of magnets are provided for attracting an appropriate number of lead frame strips among the strips and pulling the cut lead frame strips away from the adjacent lead frame strips in a direction in which their surfaces are separated from each other. 1. A lead frame separation device, comprising: an unloading device.